I tested a little in Carrara 6.2. The included demos work ok. Outside of the demos it seems there are some bugs that come up, but I think they're something that has always been in that version of Carrara rather than anything you did. (Seems like certain actions can trigger a bad memory leak when dealing with sound. Ends up freezing and needing task manager if not a full reboot.) The only thing that might be PyCarrara related is that occasionally some MicroSoft Visual C++ error will occur when editing a Python script in the window in Carrara. Why it does that, who knows?

I did get something simple working to show for it though. So it does have its uses when Carrara is willing to go along with it.

http://www.youtube.com/watch?v=1a7RIJgSXq8

Oh and the manual seems to read alright, I didn't catch anything in the technical stuff. (But then again, my knowledge of Python is limited.) Only thing that I'd change in translation is "boomer" to "speaker" or "woofer" depending on how specific you'd want it. Oh and you might want to note that the sound has to be at very first frame for the script to detect it. (Just have to edit the sound and add silence to the beginning if you need it timed different.)

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Barbequed Pixels?

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There might be something worth downloading.